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Dc charging pile power switch chip drive circuit

Main component

Concept:

The drive circuit of the DC charging pile power switch chip refers to the circuit used to control and drive the power switch device (such as MOSFET, IGBT, etc.), which ensures that the power switch device can act accurately in accordance with the predetermined logic and timing to achieve efficient power conversion and stable output.

Function:

The main functions of the drive circuit include:

1. Signal amplification: The signal output of the control chip is amplified to a level sufficient to drive the power switching device.

2. Isolation protection: Protect the control chip and power switch device through isolation technology to prevent high voltage damage.

3. Precise control: Ensure that the power switching device is accurately turned on and off to achieve efficient energy conversion.

4. Protection function: including over current, over voltage, under voltage, short circuit and other protection functions to ensure the safe operation of the system.

Working Principle:

1. Signal input: The driver circuit receives signals from the control chip, which usually include PWM (pulse width modulation) signals to control the switching state of the power switching device.

2. Signal amplification and isolation: Use an isolated driver (such as the Si826x/Si823x module) to amplify and isolate the control signal to drive the power switching device. Isolation technologies can be optocouplings, magnetic couplings or capacitive couplings, etc., whose role is to provide electrical isolation and protect the control circuit from high voltage damage.

3. Drive power switching device: The amplified signal drives the power switching device, such as MOSFET or IGBT, through the drive circuit to control its opening and closing. For example, the SECO-LVDCDC3064-SIC-GEVB[8] isolated power supply is used as the power supply for the SiC driver circuit, providing the required -5V and 20V stable voltage rails to drive SiC transistors efficiently.

4. Soft switching technology: In order to reduce the switching loss, the drive circuit may use ZVS (zero voltage switch) soft switching technology to reduce the loss of the power device during the switching process by accurately controlling the switching timing.

5. Protection mechanism: The drive circuit also includes DESAT (desaturation) protection calculation to prevent the power device from being damaged under abnormal conditions. For example, use a 14.3kΩ resistor to set the DESAT current in the range of 85 to 115A to trigger.

6. Feedback and regulation: The drive circuit may also include a feedback mechanism to adjust the drive signal by detecting the state of the power switching device, such as voltage and current, to ensure the stable operation of the system.

7. PCB layout: The PCB layout of the SiC gate drive circuit is critical to ensure circuit performance, including the design of the source current, absorption current and clamped current path.

Sum up

Through the above principles, the drive circuit of the DC charging pile power switch chip ensures the efficient, stable and safe operation of the power module, and is a key part of achieving high power density and high efficiency design.

DC CHARGING PIlE SERIES

DC charging pile is an efficient charging facility for electric vehicles, which uses direct current (DC) to directly charge the vehicle battery, significantly reducing the charging time. Compared with traditional AC charging piles, DC charging piles are able to provide higher power output and can usually charge an EV to 80% of its capacity in 30 minutes, providing users with a convenient charging experience.

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